Monday, 28 December 2015

Interesting Scientific Phenomena in Our Daily Lives

·The launching of Earth satellites should be from a place near the
equator to take the fullest advantage of the earth’s movements. The regions of
the Earth closer to the equator.

·The person jumping out of a moving train is carried forward in the
direction of the train because the person himself is in motion sharing the
velocity of the train and will continue in its state of uniform motion unless
it exercises some force to prevent it (Newton’s first law of motion).

·The sky appears blue because the light of the sun is spread or scattered
by the dust particles in the air. In space the sky would appear black as there
are no dust or air particles to scatter the light.

·Ultrasonic
waves are used for stirring liquid solutions because they can produce perfectly
homogeneous solutions.

·Water extinguishes fire because as it evaporates, the temperature of the
burning body is lowered, thus retarding or stopping the burning action also the
resulting vapours surround the burning substance cutting off the oxygen supply
thus inhibiting the burning process. In fact hot water will extinguish fire
more quickly than cold water as hot water will vaporize faster.

·Water from a hand pump is warm in winter and cold in summer because in
winter outside temperature is low and in summer outside temperature is higher
as compared to the temperature of water obtained from underground which remains
practically unchanged due to earth being bad conductor of heat.

·Water kept in an earthen pitcher becomes cold because the pitcher has
minute pores on its surface which absorb water. Water in the pores evaporates
when it comes in contact with air, and produces a cooling effect.

·We experience difficulty in breathing on mountains because the pressure
of the air out side is less as compared to the pressure of the pressure of air
inside the lungs.

·When a
bottle of perfume is opened in one corner of a room the smell spreads soon
throughout the room. This is an example of Diffusion.

·When a gun is fired at a visible distance, the sound is herd a little
after the smoke is seen because the velocity of light is much higher than that
of sound.

·When ice floating in a glass of water melts, the level of water remains
unchanged because as a solid, ice displace an equal volume of water.

·Whenever there is water loss from the body, secretion of saliva is
reduced resulting in dryness of the mouth and stimulating the sensation of
thirst. Intake of fluid then helps in restoring the loss of the water.